Studies on Varietal Resistance of Cowpeas to the Cowpea Weevil, Callosobruchus rhodesianus (Pic)

Ndlovu, T. M.; Giga, D. P.

doi:10.1017/s174275840001016x

Cited by 2 publications

(3 citation statements)

References 12 publications

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“…The resistance in these lines was later found to hold against several geographical strains of C. maculatus (Dick & Credland, 1986). Also, Ndlovu & Giga (1988) found Tvu 2027-derived lines such as IT81D-1032 and IT81D-1064 to be moderately resistant to C. rhodesianus (PIC).…”

Section: Discussionmentioning

confidence: 99%

“…These observations agree with this study in which cultivars from California, Clemson and Bengpla, which had high percent adult emergence, recorded the greatest damage and weight loss. Ndlovu & Giga (1988) reported that the emergence pattern and percent adult emergence in resistant cowpea lines are characterized by delayed, staggered and slow adult emergence while in susceptible lines, the adult emergence is relatively early and extremely rapid. Through systematic screening of over 10,000 cowpea germplasm lines, Singh (1977) and Singh et al (1985) identified Tvu 2027, Tvu 11952 and Tvu 11953, local lines from Nigeria, as moderately resistant to bruchids.…”

Section: Discussionmentioning

confidence: 99%

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Evaluation of susceptibility of some elite cowpea cultivars to attack by Callosobruchus maculatus (F.) (Coleoptera: Bruchidae)

Asante¹,

Mensah²

2008

Ghana Journal of Agricultural Science

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Fifteen elite cowpea cultivars were evaluated for their susceptibility to attack and damage by the most destructive storage pest, Callosobruchus maculatus (F.), based on the number of eggs laid, total developmental time, percentage adult emergence, seed weight loss, and growth index. Significantly, more eggs were laid on the seeds of Bengpla, California and Clemson genotypes than on those of the other cultivars. The mean developmental time (days) of C. maculatus ranged from 21.4 days on California 20 to 25.7 days on Sul 518-2 (Marfo tuya), and was significantly different between the cowpea cultivars. Adult emergence was considerably high on Bengpla, California and Clemson genotypes, but low on IT94K-445-2, Melack, and Sul 518-2. Weight loss ranged from 7 to 35.6 per cent and was significantly different between cultivars. The IT94K-445-2, IT98K-279-3 and Valenga cultivars had the least damage whilst California 11, IT87KD-1951 and Bengpla had the highest loss in seed weight. Overall, the susceptibility indices which ranged from 4.8 to 9.4 indicated that IT94K-445-2, Melack, Sul 518-2 and IT98K-279-3 were the least susceptible, whereas Bengpla, California and Clemson were the most susceptible cultivars. Therefore, it is recommended that IT94K-445-2, Sul 518-2, Melack, and IT98K-279-3 that have some degree of resistance to C. maculatus in this study should either be promoted or incorporated into breeding programmes because this will help to considerably reduce storage losses that farmers incur.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Evaluation of susceptibility of some elite cowpea cultivars to attack by Callosobruchus maculatus (F.) (Coleoptera: Bruchidae)

Asante¹,

Mensah²

2008

Ghana Journal of Agricultural Science

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“…Coloured seed coats in the Kersting's groundnut landrace cultivars used in the study probably contained more of these chemical compounds and thus, making them unsuitable for oviposition than their white-seeded counterparts. Ndlovu and Giga (1988) reported that the pattern of adult emergence and percentage adult emergence of C. maculatus in resistant cowpea ones were characterized by delayed, staggered and slow adult emergence while in the susceptible lines, adult emergence was relatively early and extremely rapid. This might explain the prolonged egg development and few progenies emerging from the Najung-black and Nakori-brown landrace cultivars recorded in this study.…”

Section: Discussionmentioning

confidence: 99%

Susceptibility of Some Kersting’s Groundnut Landrace Cultivars to Infestation by Callosobruchus Maculatus (Fab.) [Coleoptera: Bruchidae]

Badii¹,

Asante²,

Bayorbor³

2012

Jnl Sci Tech

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Seeds of five different landrace cultivars of Kersting's groundnut, Macrotyloma geocarpum (Harms) Marechal and Baudet, obtained from northern Ghana, were evaluated for their susceptibility to infestation and damage by the pulse beetle, Callosobruchus maculatus Fab. The completely randomized design was used to obtain data on the oviposition, developmental period, progeny emergence, weight loss in seeds and susceptibility index. The results showed that the Nakpanduri-white, Heng-mottle and Damongo-cream landrace cultivars proved to be the highly preferred hosts to C. maculatus, recording the highest egg load and progeny emergence, as well as the shortest egg-adult developmental period, and highest seed weight loss. The Najung-black landrace cultivar was the least preferred, followed by the Nakori-brown cultivars. Results from susceptibility indices further indicated that the Najung-black and Nakori-brown were the least susceptible to C. maculatus, while Nakpanduri-white was the most susceptible. Overall, the Najung-black and Nakori-brown landrace cultivars consistently demonstrated high tolerance to the pest and therefore, should be promoted or incorporated into breeding programmes to help minimize the high losses incurred by farmers during storage.

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Studies on Varietal Resistance of Cowpeas to the Cowpea Weevil, Callosobruchus rhodesianus (Pic)

Cited by 2 publications

References 12 publications

Evaluation of susceptibility of some elite cowpea cultivars to attack by <i>Callosobruchus maculatus</i> (F.) (Coleoptera: Bruchidae)

Evaluation of susceptibility of some elite cowpea cultivars to attack by <i>Callosobruchus maculatus</i> (F.) (Coleoptera: Bruchidae)

Susceptibility of Some Kersting’s Groundnut Landrace Cultivars to Infestation by <em>Callosobruchus Maculatus</em> (Fab.) [Coleoptera: Bruchidae]

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